The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 01, 1981
Filed:
Feb. 06, 1980
Geoffrey M Dodwell, Brentwood, GB;
Ciba-Geigy AG, Basel, CH;
Abstract
Film base material is provided which comprises a film of biaxially oriented synthetic linear polyester of highly hydrophobic character having superimposed thereon adherent to said film a subbing layer obtained from an aqueous latex of a copolymer which has been prepared by copolymerizing vinylidene chloride, an alkyl acrylate or methacrylate and optionally a copolymerizable acid and/or at least one allyl, methallyl or vinyl monomer which contains either an active halogen group or an active methylene group in the presence of a mixture of (a) an anionic surfactant which is either an alkyl aryl polyether sulphate, sulphonate or phosphate and (b) a nonionic surfactant which is an alkyl aryl polyalkylene oxide adduct containing at least some units derived from propylene oxide. The subbing layer improves the adhesion between the film support and the photographic emulsion layers and prevents the separation or frilling of the layers when the final photographic film is processed. Further the surface conductivity of the film base is improved so that there is no need for a separate antistatic layer.